RE: JBA .56
I haven't seen the JBA P-Box muffler. I'll e-mail and ask about it.
I did get one flight in on a Goldberg Wild Stik with the JBA 56. The engine ran well in the air. No problems, no stopping. I stayed at half power most of the time because of the extremely wide control surfaces on the Wild Stik. There was no loading up at half power.
Vertical on the 5 1/2 lb plane was excellent. I can take off and rotate immediately and keep going on up.
The idle was good and the engine shut down after a slight delay.
I would have flown more, but I've been under the weather with a cold virus that has hit everyone at work and the wife at home. I wasn't feeling like doing anything except one flight to see the JBA fly. Maybe this weekend, if the weather cooperates.